Which of the following best sums up current scientific thinking about the nature of dark matter?
A) Most dark matter probably consists of weakly interacting particles of a type that we have not yet identified.
B) Dark matter consists 90% of neutrinos and 10% of WIMPs.
C) There is no longer any doubt that dark matter is made mostly of WIMPs.
D) Dark matter probably does not really exist, and rather indicates a fundamental problem in our understanding of gravity.
A
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If you lived on the Moon how often would the Earth set below your horizon?
a. Every 24 hours b. Once a sidereal period (27.3 days) c. Once a synodic period (29.5 days) d. Every year e. Never
The centroid of the assemblage of lines shown in the figure below is at coordinates (x, y, z):
(A) L/2, L/3, L/2
(B) L/2, L/6, L/6
(C) L/2, L/6, L/4
(D) L/2, L/3, L/6
Equal currents of magnitude I travel into the page in wire M and out of the page in wire N. Eight directions are indicated by letters A through H
The direction of the magnetic field at point P is
a.
C.
b.
E.
c.
F.
d.
G.
e.
H.
A material that resists any type of stress applied to it when the magnitude of the stress does not exceed some limit is a
A) liquid. B) solid. C) gas. D) liquid crystal. E) fluid.